Mortise latch lock



2 Sept. 8, 1931. ELLINGSON 1,822,278

MORTI SE LATCH LOCK Filed March 3, 1930 IN VEN TOR.

E LL {N6 ELL/ vmsa/w A TTORNEYS.

Patented Sept. 8, 1931 r PATENT OFFICE ELLING ELLINGSON, OF SAN FRANCISCO, CALIFORNIA V Mon'rrsn LATCH LOCK Application filed March 3, 1930. Serial No. 432,849.

The present invention relates to improvements in mortiselatch locks, and its principal object is to provide a latch lock that is simple and rugged in construction, and that may be easily installed.

A further object of the invention is to provide a lock of the character described in which a latch bolt may be connected to the operating mechanism after the latter has been positioned. A further object of the invention is to provide independent opera ting members for the latch bolt in a single casing extending through the door and to provide .means in connection with the operating members for allowing the same to become active on the latch bolt in a certain specified manner.

A further object of the invention is to provide a key operated member on the outside of the door and a knob operated member on the inside of the door for manipulating the latch bolt.

A further object of the invention is to cause the two operating membersto cooperate in such a Way that the key operated member may lock the latch bolt in active as well as in inactive position, and may also occupy a position in which the latch may be freely operated by the other member.

Further objects and advantages of my invention will appear as the specification proceeds.

The preferred form of my invention is illustrated in the accompanying drawings in which Figure 1 shows a horizontal section through a door and a door casing showing my latch lock partly in section and partly in plan,

. Figure 2 shows a side view of the operating mechanism for the latch,

Figure 3 a horizontal section through the same,

Figure 4 a vertical section taken along line 4- 1 of Figure 3,

Figures 5, 6 and 7 vertical sections taken along line 55 of Figure 3 showing various positions of the operating members, and

Figure 8 a detail view of the latch bolt.

'While I have shown only the preferred form of my invention, I wish to have it un derstood that various changes or modifica: tions may be made'within the scope of the claims hereto attached without departing from the spirit of the invention.

My latch lock is intended for use in con nection with adoor 1 having two intersecting mortises 2 and 3,.the former passing through the door in parallel relation to the front edge, and the latter entering through the front edge. My lock comprises two principal parts, the latch bolt 4 and the operating mechanism 5. The latch bolt is slidably mounted in a casing 6 inserted in the end mortise and comprises a tapered member 7 adapted for entering into a recess 8 formed in the door casing 9 and-a rod 10 extending therefrom rearwardly and through the rear wall of the casing 6, a spring 11 normally urging the latch bolt outward. The rod 10 terminates at its rear end in a hook 12 made of elastic material and has adjustable means for closing the opening 13 of the hook in a key 14 'slidably mounted in a key way 15, the key being adapted for operation bymeans of a set screw 16 entering the bolt through its inclined end face. A projection 17 at the end of the key 14 is adapted for entry into a slot 18 at the end of the hook 12.

The operating mechanism for the latch bolt comprises a preferably cylindrical casing 19 adapted for insertion into the mortise 2 and reaching from one face of the door to the other and formed with a flange 20 adapted to be received in a recess 21 in the inner face of the door, and to be fastened to the latter e by means of screws 22. This casing has revolvably mounted therein two operating members 23 and 24:, the former being manipulated by means of a knob 25 from the inside of the door and the latter by meansof a key 26 from the outside of the door. The member 23 is formed with an annular groove 27 adapted to receive a set screw 28 which holds the member against endwise movement. A pin 29 held in the body of the member 23 projects inwardly therefrom in eccentric relation thereto, and its inner end is bent as shown at 30 so as to project into a semicircular slot 31 formed in the wallof the casing 19. This pin is adapted for fastening to the hook 12 of the latch bolt after the member 23 has been positioned. The member 23 for this purpose is turned so as to cause the pin to occupy its highest position on the circle, whereupon the bolt is introduced from the end. The key 14: in the bolt is withdrawn to an inoperative position before the insertion of the latter, so that the free hook passes underneath the pin, and may be engaged therewith by suitable turning motion of the pin, and forward motion of the latch bolt under the influence of the spring 11. fter the hook has been engaged with the pin the key M is advanced and pushed up against the pin by means of the set screw 16 so that the pin is now secured within the hook.

The member 24 is held in the casing 19 against endwise movement by the set screw 32 entering an annular groove 33. This member terminates at its inn ,1 end in a segment 3% somewhat less than semicircular, which may occupy three principal positions as illustrated in Figures 5, (i and 7. When in the position shown in Figure 5 the segment occupies the lower section of the easing and does not interfere with the movements of the pin 29 which are confined to the upper section of the casing due to the fact that the bent end of the pin 29 operates in the slot 31, which is substantially confined to the upper portion of the casing, and prevents the pin from reaching a dead-center position, an arc of somewhat more than 90 degrees and less than one hundred degrees being suliicient for the pin movement. Nhen the segment is in this position it does not interfere with any movement of the pin 29, and the latch, and this position may therefore he referred to as the inactive position of the segment.

The segment 34 may be swung around from the position of Figure 5 into the reverse positions of Figures 6 and 7, the position of Figure 6 being reached by a movement through 180 degrees, in an anti-clockwise direction, and the position of Figure 7 by a similar movement in a clockwise direction. In executing these movements the segment 84: operates the pin 29 and through the latter the knob and the latch bolt 4-. lVhen in the position of Figure 6 the segment 34 holds the pin 29 in advanced or bolt locking position, and effectively prevents retraction of the latch bolt by means other than the proper key, and in the position of Figure 7 the segment 3s: holds the pin and the bolt in inactive or non-locking position.

The member 24 may be locked to the easing 19 by any suitable key operated lock mechanism, which in the drawing is represented by a number of slotted spring pressed tumblers 35 adapted .to enter either one of two sets of corresponding perforations 86 and 37, engagement with the former perforations locking the member in the position of Figure 5, and engagement with the latter perforations locking the member in the positions shown in Figures 6 and 7, which are identical as far as the segment 34L is concerned.

The advantages and operation of my improved mortise latch lock will be readily understood from the foregoing description. The casing and the two revolvable members 23 and 24 may be inserted into the transverse mortise as a unit, and after this unit has been positioned the latch bolt may be inserted and the hook 12 thereof engaged with the pin 29 in the manner previously described. When the member 24 is locked in the position of Figure 5 the latch bolt may be freely operated by means of the knob 25. The key operated segment 3% may be turned by either a right hand or a left hand movement into the positions of Figures 6 and 7 for holding the latch bolt in either locking or non-locking position as may be desired.

1 claim:

1. A mortise latch lock comprising the combination with a door having intersec'.ing lock and bolt mortises, of a cylindrical casing secured in the lock mortise, a key-operable cylinder mounted in one end of the casing, a knob shank rotatably mounted in lie other end of the said casing and having an actuating member thereon, a bolt slidably mounted within the bolt mortise having means for connec ing the same to the actuating member, an extension carried by the cylinder adapted to occupy an inactive position for allowing the bolt to be actuated by the knob shank and to more .he bolt either into locking or into non-locking position and means for locking the cylinder in its inactive position as well in its active position.

2. A mortise latch lock comprising the COllflbllltltlOll with a door l'iaving, intersecting lock and bolt mortises, of a cylindrical casing secured in the lock mortise, two members revelvable in opposite ends of the casing, a latch bol. slidable in the bolt mortise, means for connecting the bolt to one of the members for operation thereby into locking and non-locking positions respectively and means associated with the second. member for locking illC latch bolt in either of said positions.

3. A. mortise latch lock comprising the combination with a door hating intersecting lock and bolt mortises, of a cylindrical casing secured in the lock mortise. two members rcvolvable in opposite ends of ihe casing, a latch bolt slidahle in the bolt mortise, means for connecting the bolt to one of the memhers for operation thereby into locking and non-locking positions respectively, and means associated with the second member for locking the lach. bolt in either of said positions, the said means being also adapted to occupy an inactive position.

4:. A mortise latch lock comprising the combination with a door having intersecting lock and bolt mortises, of a casing extending through the lock mortise, a member revolvable therein having a pin extending therefrom eccentrically and a latch bolt slidabl-e in the latch mortise having a rod extending therefrom ierminating in a hook adapted for engagement with the pin while the latter is in position within the casing.

5. A mortise latch lock comprising the combination with a door having intersecting lock and bolt mortises, of a casing extending through the lock mortise, a member revo1vable therein having a pin extending therefrom eccentrically and a latch bolt slidable in the la ch mortise having a rod extending therefrom terminating in a hook adapted for engagement with the pin while the latter is in position within the casing, with means operable from the oniside of the door for interlocking the hook with the pin.

6. A mortise latch lock comprising the combination with a door having intersecting lock and bolt mortises, of a casing extending through the lock mortise, a member revolvable therein having a pin extending therefrom eccentrically and a latch bolt slidable in the latch mortise having a rod extending therefrom "terminating ina hook adapted for engagement with the pin while the latter is in position within the casing, the wall of the casing being slot'ied to allow the rod to move in the slot whereby the pin movement is limited by the length of the slot.

7. A mortise latch lock comprising the combinai ion with a door having intersecting lock and bolt mortises, of a casing extending through the lock mortise, two members revolvable in opposite ends of the casing, a pin extending from one of the members, a bolt slidable in the bolt mortise having means for connec'ing the same to the pin and a segment associated with the second member and adapted to operate the pin.

8. A mortise latch lock comprising the combination with a door having intersecting lock and bolt mortises, of a latch bolt slidable in the bolt mortise, means within the lock mortise and operable from one side of the door for moving the bolt into locking and non-locking position and means within the lock mortise and operable from the other side of the door for locking the bolt in either position, the latter means having means associated therewith for locking the same in inactive position.

ELLING ELLINGSON. 

